Coffee-making apparatus



March 13, 1951 HOTVEDT 2,544,836

COFFEE MAKING APPARATUS Filed May 19, 1947 5 Sheets-Sheet l INVENTORRICHARD D. HoTvE DT BY )1 7303M AT TORNEY March 13, 1951 Filed May 19,1947 R. p. HOTVEDT COFFEE MAKING APPARATUS 5 Sheets-Sheet 2 VINVENTOR 1cHARD D. HoTvE DT ATTORNEY March 13, 1951 Filed May 19, 1947 R. D.HOTVEDT 2,544,836

COFFEE MAKING APPARATUS 5 Sheets-Sheet 3 INVENTOVR RICHA D De HoTva DTBY 2%. EQW

AT TORNE Y March 13, 1951 D, HOTVEDT 2,544,836

COFFEE MAKING APPARATUS Filed May 19, 1947 5 Sheets-Sheet 4 INVENTOR RmHARD D. HQTVEDT ATTORNEY March 13, 1951 R. D. HOTVEDT 2,544,836

COFFEE MAKING APPARATUS Filed May 19, 1947 5 Sheets-Sheet 5 low.

INVENTOR RlCHARD D, Horvz: DT

BY fi m AT TOR NEY Patented Mar. 13, 1951 UNITED STATES PATENT OFFICE 13Claims. I

This invention has relation to an apparatus adapted to be put to use tobrew cofiee.

An object of the invention is to provide a coffee making apparatus whichwill be of novel and improved construction.

A further object is to provide an apparatus for brewing coifee whereinwill be incorporated desirable and improved features and characteristicsof construction novel both as individual entities of the apparatus andin combination with each other.

And a further object is to provide an apparatus for making coiiee whichwill be of construction and adapted to function in the manner ashereinafter set forth.

With the above objects in view, as well as others which will appear asthe specification proceeds, the invention comprises the construction,arrangement and combination of parts as now to be fully described and ashereinafter to be specifically claimed, it being understood that thedisclosure herein is merely illustrative and intended in no way in alimiting sense, changes in details of construction and arrangement ofparts being permissible as long as within the spirit of the inventionand the scope of the claims which follow.

In the accompanying drawings forming a part of this specification,

Fig. 1 is a front elevational view of a coffee making machineincorporating the features and characteristics of the invention;

Fig. 2 is a vertical sectional view, taken substantially on line 22 inFig. 4;

Fig. 3 is a horizontal sectional view, taken substantiall on line 3-3 inFig. 2;

Fig. 4 is a vertical sectional view, taken substantially on line 4-4 inFig. 2;

Fig. 5 is a horizontal sectional view, partially broken away, takensubstantially on line 5-5 in Fig. 2;

Fig. 6 is an enlarged elevational view, partially in section andpartially broken away, of a hopper and dumping mechanism for coifee ofthe apparatus;

Fig. '7 is a sectional view detailing a type of float switch several ofwhich are included as parts of the apparatus;

Fig. 8 is a view, partially in elevation, partially in section andpartially broken away, detailing a type of solenoid operated valveseveral of which are included as parts of the apparatus;

Fig. 9 is a sectional view, taken substantially on line 99 in Fig. 1,detailing a main and a pair of selective switches of the apparatus;

Fig. 10 is a sectional view, taken substantially on line l0l0 in Fig. 3,detailing a thermostatically operated switch of said apparatus;

7 Fig. 11 is a sectional view, taken substantially on line II-I| in Fig.3, detailing a float controlled valve of the apparatus;

Fig. 12 is a sectional view, taken substantially on line I2l2 in Fig. 5,detailing a removable strainer of said apparatus and parts with whichsaid strainer is associated;

Fig. 13 is a plan view of the strainer as it would appear when removedfrom the apparatus;

Fig. 14 is a sectional view, taken substantially on line I4l4 in Fig. 4,detailing a timing mechanismv of said apparatus; and

Fig. 15 is a schematic view of a wiring system for the apparatus.

With respect to the drawings and the numerals of reference thereon, thecofiee making apparatus includes a main or first tank 26, and auxiliary,or

second and third, tanks, denoted 2| and 22, re-

spectively. The main or first tank 25 is constituted as a waterreceiving upper vessel of the apparatus, and the auxiliary, or secondand third, tanks 2 land 22 are constituted as water receiving lowervessels of said apparatus.

A water jacket in surrounding relation to said auxiliary, or second andthird, tanks 2| and 22 is denoted 23, and said main or first tank 25 isopen to said water jacket at 24. The auxiliary, or second and third,tanks 2| and 22 are in spaced apart relation in a single horizontalplane and directly below and in adjacent relation to the main or firsttank 20 in the disclosure as made. The auxiliary, or second and third,tanks 2! and 22 are open at their upper portions and are otherwiseclosed. Manually actuable faucets for controlling outlets from lowerportions of the tanks 21 and 22 are indicated 25 and 26, respectively,and a manually actuable faucet for controlling an outlet from the waterjacket 23 is represented 21.

The tanks 20, 2| and 22 and the water jacket 23 are co nstituted as aunitary structure, and said unitary structure additionally includes apressure reducing, or fourth, tank 28 which is as shown at a side of andin proximate relation to the upper portion of the tank 20, above thetank 22. The main or first and the pressure reducing or fourth tanks 29and 28 are constituted as closed vessels. An outlet for air from anupper portion of said main or first tank 26 is designated 29, and anoutlet for air from an upper portion of said pressure reducing or fourthtank 28 is represented 30.

An inlet pipe connection 3| is adapted to lead from a source (not shown)of water supply under pressure into the pressure reducing or fourth tank28 by way of a float controlled valve 32 within said pressure reducingor fourth tank. A float 33 for said valve 32 is situated in an upperportion of the interior of the pressure reducing or fourth tank 28, andthe construction and arrangement are such that said float will cause thevalve 32 to be in closed condition, as in said Fig. 11, when the levelof water in said pressure reducing or fourth tank has reached apredetermined level and will otherwise cause said valve 32 to be in opencondition. Normally, there will be water in the pressure reducing orfourth tank 28 up to the level permitted by the float 33.

A pipe connection 3d leads from the lower wall of the pressure reducingor fourth tank 28 into the interior of the lower portion of the main orfirst tank 26, and a solenoid operated valve 35 along the length of saidpipe connection 36, is for controlling passage of water from saidpressure reducing or fourth tank into said main or first tank.

The coffee making apparatus includes several solenoid operated valves ofthe same type as the solenoid operated valve 35, and in Fig. 8 of thedrawings one of these solenoid operated valves is disclosed in detail. Asolenoid casing 36 houses a valve plug 3? adapted to be held in theclosed condition of a passageway, as in said Fig. 8, by a coil spring 38when the solenoid is deenergized and to be held in the open condition ofsaid passageway against the action of said coil spring when saidsolenoid is energized.

The main or first tank 24 is bounded at its forward side by a vertical,rectilinear structure 3%) which projects into and extends upwardlyacross the whole of thedepth of said main or first tank, and saidvertical, rectilinear structure 39 provides a rectilinear space 20 forreceiving a hopper and dumping mechanism for cofiee. More explicity, thevertical, rectilinear structure 39 is constituted as a rear wall ll,parallel with the forward wall of the main or first tank 29, spacedapart end walls 32, 32 parallel with each other and perpendicular to therear wall 4|, and a front wall d3 between the forward edges of the sidewalls 42, 42 and continuous with said forward Wall of said main or firsttank 29. The rear and side walls d2, 42 effectually separate therectilinear space Ill) and the interior of the main or first tank 2!}from each other, and the front wall 13 is at the sides of the-side walls42-, t2 opposite said interior of said main or first tank. The lowerportion of the vertical, rectilinear structure 39 is open.

The auxiliary, or second and third, tanks 2] and 22 support, in anysuitable and convenient manner, a frame 44 which is situated betweensaid tanks 2! and 22 directly below the rectilinear space All. An upperportion of the frame 45 is constructed to provide a brewing chamber iiiwhich is open at its upper portion and defined at its side and rearportions by a vertical wall 46, at its front portion by the front wallas and an openable door 4? pivotally supported, as at 48, upon saidfront wall 43, and at its lower portion by a downwardly diverging wall39. The construction and arrangement will be such that the door 41 whenclosed will be in water-tight relation to said front wall ea. A pipeconnection leadingvertically downwardly from the bottom of thedownwardly diverging wall 49 is indicated 50, pipe connections leadinghorizontally 4 from an upper portion of the pipe connection 50 to upperportions of the tanks 2! and 22 are denoted 5! and 52, respectively, andpipe connections leading from the lower end of said pipe connection 50to lower portions of said tanks 2! and 22 are designated 53 and 54,respectively. Solenoid operated valves in each of the pipe connections5i, 52, 53 and 54, equivalent to the sole noid operated valve 35, arerepresented 55, 53, 5? and 58, respectively.

A pipe connection 59 leads from the lower end of the vertical pipeconnection 5% to an upper portion of the brewing chamber i5 and opens tosaid brewing chamber at a location above a strainer 60 in the upperportion of the brewing chamber, and a pump iii in the pipe connection 59is adapted to be driven by an electric motor 62.

The hopper and dumping mechanism for coffee which the rectilinear spaceit, provided by the vertical, rectilinear structure 39, is adapted toreceive is clearly disclosed in Figs. 2, 3, 4 and 6 of the drawings. Asthere shown, a hopper for receiving granulated coffee beans isdesignated 53, and a removable cover for said hopper, shown in Fig. 1,is indicated (it. The hopper 53 includes an open lower end or outlet 65situated directly above the strainer 60, and said hopper is supportedwithin the vertical, rectilinear structure 39 in any suitable andconvenient manner. The lower end portion of the hopper, adjacent theoutlet 65, houses a dumping mechanism including a wheel 66 fixedlysupported on a horizontal shaft 67 rotatably mounted in the hopper andadapted to be rotated by an electric motor 68. The periphery of thewheel 56 includes equally spaced, radially extending members 69providing separate compartments It for granulated coffee beans. Saidwheel 66 is adapted to be driven by the electric motor 68, in thedirection of the arrow in Fig. 6, through the instrumentality of a wormH fixed on the shaft of said electric motor which meshes with a wormwheel 12 fixed on the hori zontal shaft Bl. The construction andarrangement will be such that when the wheel 66 is stationary, passageof granulated coffee beans from the upper portion of the hopper 63 tothe hopper outlet 65 will be precluded and that when said wheel isrotated, measured quantities of granulated coffee beans will be fed tosaid outlet 65 and permitted to fall by gravity into the strainer 6B.

A lower portion of a side wall 52 of the vertical, rectilinear structure39 includes a port 88 which opens to a solenoid operated valve 853,equivalent to th solenoid operated valve 35, and a pipe connection fromsaid'solenoid operated valve 89 opens to the brewing chamber 45 at alocation above the strainer Eli.

A timing mechanism of the apparatus is clearly disclosed in Figs. 4, 5and 14. As there shown, 13 represents a contact ring insulatively,stationarlly supported on the water jacket 23 at location between thetanks 2i and 22 and at the rear of the brewing chamber 45. A conductingrod is is adapted to be rotated while engaged with an internalcylindrical conducting surface of said contact ring 73, and saidinternal cylindrical conducting surface '15 includes an insulatingportion 76. Rotation of said conducting rod i4 is adapted tobeaccomplished by an electric motor ll, suitably and convenientlysupported on the water jacket 23, through the instrumentality ofreducing mechanism housed in a gear box 78 insulatively supported uponsaid water jacket.

A thermostatically operated switch of the apparatus is clearly disclosedin Figs. 2, 3, 4 and 10. A bulb 79 situated within the main or firsttank 20, at about the midheight of said main or first tank, is integralwith an L-shape tube 80 which passes outwardly of and is supported in anopening through said main or first tank, and said L-shape tube 80integrally supports a bellows 8I. Said bulb l9, L-shape tube 80 andbellows 8| constitute an entity containing expansible and contractiblefluid. A switch 82, suitably and conveniently supported on the tank 20,includes spaced apart, fixed contact elements 83 and 84 and a movablecontact element 85 between said fixed contact elements 83 and 34. Thebellows 8| is adapted to be in a contracted condition to situate anactuator 86 on said bellows to permit the movable contact element 85 tobe engaged with the fixed contact element 83 and separated from thefixed contact element 84 when the temperature of water in the tank 20 isrelatively low and to be in an expanded condition to situate saidactuator to cause said movable contact element 85 to be engaged withsaid fixed contact element 84 and separated from said fixed contactelement 83 when the temperature of water in said tank 20 iscomparatively higher. The construction and arrangement are such that theelements 83, 85 will be engaged and the elements 84, 85 will bedisengaged when the temperature of water in the tank 20 is relativelylow and an electric heater 8'! of the apparatus is to be energized andthat the elements 84, 85 will be engaged and said elements 33, 85 willbe disengaged when the temperature of water in said tank 20 has reacheda predetermined high temperature at which said electric heater 3? is tobe deenergized. The electric heater 8? is, in the disclosure as made,suitably and conveniently supported beneath the tank 20. a

A float switch 9! is suitably and conveniently supported in an upperportion of the main or first tank 20, and float switches, denoted 92 and93, respectively, are suitably and conveniently supported in upperportions of the auxiliary, or second and third, tanks 2| and 22.

The float switches SI, 92 and 93 can b of duplicate construction. Fig. 7discloses a type of float switch suitable for use in the apparatus andequivalent to any of the float switches 9I, 92 and 93. A Bakelite casing94 fixedly supports a contact element 95 and movably supports a contactelement 96. A float 9T, rigid with said movable contact element 96, isadapted to be situated at a lower elevation, as in said Fig. '7, tocause the fixed and movable contact elements 95 and 96 to be engagedwhen water in the tank having the float switch is below a predeterminedlevel and to be situated at a higher elevation to cause said fixed andmovable contact elements 95 and 96 to become disengaged when the waterhas reached a predetermined high level.

Lead wires to and from the float switch 9I are denoted 98 and 99, leadwires to and from the float switch 92 are represented I and IOI, andlead wires to and from the float switch 93 are indicated I02 and I03.

A switch box I04, rigid with the forward wall of the apparatus, rigidlycontains a main switch I05 and a pair of selective switches, designatedI06 and I07, respectively.

The main switch I05 includes fixed contacts I08, l08' adapted to bebridged by a movable contact element I09, fixed contacts H0, H0 adaptedtoibe bridged by a movable contact element II I, and

a push button I I2 for operating the movable contact elements I09 andIII in unison. The con struction and arrangement are such that theelements I08, I09, I08 and H0, III and H0 are normally in separatedrelation.

The selective switch I06 includes fixed contacts I I3, I I3 adapted tobe bridged by a movable contact element H4, and a push button H5 foroperating the movable contact element I I4. The elements II 3, H4, H3are in separated relation when a contactor H6 is deenergized, and saidcontactor I I6 is adapted when energized to retain the movable contactelement I I4 engaged with the fixed contact elements H3, H3.

lhe selective switch I0! includes fixed contacts I I1, I ll adapted tobe bridged by a movable contact element H8, and a push button H9 foroperating the movable contact element I IS. The elements I I1, H8, IIIare in separated relation when a contactor I20 is deenergized, and saidcontactor I20 is adapted when energized to retain the movable contactelement H8 engaged with said fixed contact elements III, III.

A push button I2I slidably mounted in the front wall of the switch boxI04 rigidly supports a first actuator bar I22 adapted to be actuated tocause the main switch I05 and the selective switch I06 to besimultaneously moved to closed condition, and a push button I23 slidablymounted in said front wall of said switch box rigidly supports a secondactuator bar I24 adapted to be actuated to cause said main switch I05and the selective switch Hi l to be simultaneously moved to closedcondition.

The strainer 53 is removably supported in the upper portion of thebrewing chamber 45 adjacent the opening covered by the door 47, and saidstrainer I50 includes an extension portion I25 adapted to retain aswitch I25 in closed condition when the strainer is in its operativeposition. Lead wires to and from the switch I25 are denoted I27 and I28,and the construction and arrangement are such that said switch I26 isheld in open condition when said strainer is removed from the apparatus.

Incoming lead wires I29 and I30 are from a suitable source (not shown)of electrical current.

The incoming lead wire I29 is connected to the fixed contacts I08 andIE0, and a lead wire I3i extends from said incoming lead wire I29 to amovable contact element I32 for engagement with a fixed contact I33. Acontactor I34 is adapted to retain the elements I32, I33 engaged whensaid contactor is energized, and said elements I32, I33 are adapted tobe in separated relation when the contactor I34 is deenergized. A leadwire I35 extends from the contactor I34 to the lead wires I00 and I02,and a lead wire I33 extends from the fixed contact I33 and saidcontactor I3 to the fixed contact I08.

A lead wire I31 extends from the lead wire I33 to the movable contactelement 85, and a lead wire I38 extends from the fixed contact 83 to afixed contact I39 normally engaged with a movable contact element I40. Alead wire I4I extends from the lead wire I3! to a fixed contact I42normally separated from a movable contact element I43. The elements I39,I40 are adapted to be engaged and the elements I42, I43 are adapted tobe disengaged when a contactor I44 is deenergized, and said elementsI39, I40 are adapted to be disengaged and said elements I42, I 43 areadapted to be engaged when said contactor I44 is energized. Lead wiresto and from the contactor I44 are indicated I45 and I46, and a lead wireI41 connects the movable contact eleu? 1 merits M9 and I43 to each otherand tothe lead wire 1 45. A lead wire M8 extends from the lead wire M"!to the lead wire 98, and said lead wire $8 is connected to the electricheater 81.

Alead'w-ire I43 extends from said electric heator 8'! to the solenoid ofthe valve 89, a lead wire 158 extends from said solenoid "to theelectric motor 62, a lead wire I! extends from said electric motor 62 toa lead wire I52, a rheostat along the length of the lead wire MI isdenoted I53, and the lead wire IE2 is connected to the incoming leadwire 133. The lead wire I46 is connected to the lead wires I49 and "I52,and a lead wire 154 extends between the lead Wires I4! and I53 it leadwire l-fil'extends from the incoming lead wire I29 110 the contact ringIS, the lead wire I.2l"is connected to the fixed contact I Ill, and thelead "wire 523 is connected to the conducting rod l4 and ithe'eleotricimotors 58 and TI. Lead wires .155 and 15 from said electricmotors are connected. to the incoming lead wire I38, and the lead wireI5"! includes a rheos-tat I 53. A lead wire 159., includinga pilot lampextends from the lead wire t3 to a lead wire IliI which connects'theincoming lead wire I 3-53 with the solenoid of the valve 35., and thelead wire 99 is connected to said solenoid.

The lead wire I54 connects the fixed contact 84 with the solenoid ofeach of the valves =55, 53. 55, 58, and the lead wires it'll nected tothe solenoids of the valves '55, 51' and 56, .58, respectively, as wellas to the fixed con tacts H3 and IN, respectively, and to the contactors11.6 and IZtTI, respectively. The lead wire I52 extends to the fixedcontacts -I l3 and Ill, and the contacto'rs I5, I23 are interconnectedby a lead. wire H32 which extends from the lead wire 1:31;.

The pressure reducing or fourth tank 23 of course will normally containwater up to the level a In .1'5-of the drawings, the various elements ofthe electrical equipment of the apparatus are disclosed in. thepositions they assume when the apparatus iisnot in use.

When. coffee is to be brewed in the auxiliary,

second. tank '2 I, the push button I21 will be actuatcd to cause themain switch Hi5 and the selective switch Iflfito be closed, and whencoffee is to be brewed i-n-the auxiliary, third tank 22, the push buttonI23 will be actuated tocau-se said main switch I55 and the selectiveswitch It? to be closed.

A circuit for causing the elements $32, i3 3 to become engaged will becompleted through the holding contactor I 34 upon closing of the mainswitch I05 and the selective switch I86, said circuit being traced fromthe incoming lead wire I 2.9 to said holding contactor I34 through I88,I69, I98 and ltdand thence through I35, Hill, 92, It'll, fixed contactH3, movable contact ole-- ment-Il l', fixed contact IE3 and lead wire#52 back to the incoming lead wire I39. Upon engagement of the elementsI32, I33 and I I3, II i, II-3', a holding circuit for the contactors It'l and H6 will be "established, said holding circuit being traced fromthe incoming lead wire I23 back to the incoming lead wire I39 throughIsl, I32, I33, I36, I37 and Iii-2 to the contactor H6, and thencethrough IIJI, H3, H ll, I I3 and I52.

Engagement of the elements I32, I33 estaband R13 are conlishes a circuitincluding the float switch *91 and the solenoid of the valve 35, saidcircuit being traced from "the incoming lead wire I29 through the leadwire I31 to said elements I32, I33, thence through the lead wires I36and 131 to the movable contact elem'en't 85, thence through the fixedcontact 83, the lead wire I38, the fixed contact I39, the movablecontact element I40 and the lead wires I48 and '98 to said float switch9i, thence through the lead wire 99 to said solenoid of said valve '35.,and thence through the lead wire l'IiI back to the incoming lead wireI30.

It will be evident that closing of the main switch 105 will cause thesolenoid of the valve 35 to be energized and moved to open condition topermit flow of water from the pressure reducing or fourth tank '28 intothe main or first tank 20, and that when water in said main or firstitank reaches the level causing the float switch 91 to be moved to opencondition, the energizing circuit through said solenoid of the valve '35will be broken and this valve will close to shut oil further flow ofwater into the .main or first tank.

The coffee dumper is adapted to deliver a desired amount of granulatedcoffee beans to the strainer during the interval the main or first tank2!! is becoming filled with water. Upon closing of the main switch I05,a circuit is comp'le'ted through the electric motors 68 and 7?, saidcircuit being traced from the incoming lead wire I23 through the leadWire I5 5, the fixed contact I ill, the movable contact element I I I,the fixed contact Hi), the lead wire I21, the switch F26 and the leadwire I28 to said electric motors 38 and ll, and thence from theseswitches .back to (the incoming lead wire I36 through the lead wires I56and I51. During the short interval the main switch IE5 is closed, themotor TI will operate to cause the conducting rod '14 to become removedfrom the insulating portion 16 and engage the conducting surface 75, andthus a circuit will be completed through the electric motors 63 and llfrom the incoming lead wire I29 through the lead wire I55, the contactring 13, the conducting rod 7 3 and the lead wire I-28 to said electricmotors 68 and ll, and thence back to the incoming lead wire I30 throughsaid lead wires I56 and I5?. Evidently, this latter circuit will bebroken when said conducting rod has completed a revolution back to itsposition of engagement with theinsulating portion I6. The set ting ofthe rheostat I58 will control the speed of the timer electric motor TI.The speed of the dumper electric motor 68 will be constant andindependent of the speed of the timer electric motor. The obviouspurpose of the rheostat I58 is to assist in controlling the strength ofthe brewed coffee.

The electric heater 8-1 is adapted to cause water in the main or firsttank 20 to be heated in reponse to closing of the main switch W5. Aholding circuit including the movable contact element 3-5 and the fixedcontact 83 of the thermostatically operated switch 32 andalsoincludingthe electric heater '8'! will be established when the mainswitch Hi5 is'closed, said circuit being traced fromthe incoming leadwire I29 back to the incoming lead wire I33 through I 3I, I32, 133, I36,I37, said movable contact element '85, said fixedcontactBS, I38, I39,I40, I48, 98, said electric heater 87 and I49, I46 and 152. When thewater in the main or first tank 20 becomes elevated to thedesii'ed'tempera'ture, the actuator 86 on the bellows BI will cause themovable contact element 85 to become disengaged from the fixed contact33 and engage the fixed contact 84. Upon disengagement of the elements83, 85, the circuit for the electric heater 81 will become broken andsaid electric heater will be deenergized and cease functioning.

A circuit for the oontactor I44 will be established upon engagement ofthe elements 84, 85, said circuit being traced from I29 back to I30through I3I, I32, I33, I35, I31, movable contact element 85, fixedcontact 84, I54, I41, I45, said oontactor I44, I46 and I52, and thislast mentioned oontactor upon being energized will cause the elementsI39, I40 to be disengaged and the elements I42, I43 to be en aged.Disengagement of the elements I39, I40 will preclude possibility ofenergization of the solenoid of the valve 35 in response to falling ofthe water level in the main or first tank 20, and also will preclude thepossibility of energization of the electric heater 51 in response tofalling of the temperature of the water in said main or first tank.Engagement of the elements I 42, I43 establishes a holding circuit forthe oontactor I44, said circuit being traced from I29 back to, I30through I3I, 132, 535, I31. I4I, I42, I43, I41, I45, said contactor 24,I46 and I52.

A circuit for the solenoid of the valve 89 from the incoming lead wireI29 back to the incoming lead wire I30 includes I3I, the elements I32,I33 when engaged, I35, I31, I4I, fixed contact I42 and movable contactelement I43 when engaged, 54, I50, said solenoid of said valve 89, I49,and E52.

A circuit for the solenoids of the valves 55 and 51 from said incominglead wire I29 back to said incoming lead wire I39 includes I3I, I32 andI 33 when engaged, I33, I31, I4I, I42 and I43 when engaged, 54?, I54,said solenoids of said valves 55 and 51. I04, H3, H4, H3 and I52.

A circuit for the electric motor 62 from the incoming lead wire l 29back to the incoming lead wire i230 includes l3I, I 32 and I33 whenengaged, 533, 531, 54!, I42 and I43 when engaged, I41, 953, I50, saidelectric motor 52, I5I and I52.

Immediately when the elements I42, I43 become engaged, the circuits asdescribed including the solenoid of the valve 39, the solenoids of thevalves 55, 51 and the electric motor 52 will become pipe connection 90and permitted to flow to and throrgh the strainer 50 and the granulatedcoffee beans which said strainer contains, as well as through thevertical pipe connection 50 and the pipe connection 5| into theauxiliary, second tank 2I Energization of the electric motor 62 willcause the pump 5| in the pipe connection 59 to be operative torecirculate the coffee brew or water, from the auxiliary, second tank 2|by way of the pipe connection 53 through said pipe connection 59 back tothe strainer 30 and its contained granulated coffee beans. Theconstruction and arrangement will be such that the pump SI will causethe cofiee brew or water to be pumped back to the brewing chamber 45 ata slower rate than that at which water enters said brewing chamber fromthe or first tank 20. Thus, the auxiliary, second tank 2! will becomefilled during the interval recirculation is occurring, and when thelevel of the coffee brew in said auxiliary, second tank 2] is atelevation to cause the float switch 92 to be in open condition, theholding circuit for the oontactor I34 will become broken and all of theelements of the electrical equipment of the apparatus will be in ormoved to their out of use positions as in Fig. 15. The solenoid operatedvalves 89, and 51 will be moved to closed condition and the electricmotor 62 will become deenergized immediately when the elements I32, I33become disengaged to cause the circuits including said solenoid operatedvalves 89, 55 and 51 and said electric motor 32 to become broken. Theobvious purposeof the rheostat I53 in the circuit of the electric motor52 is to assist in controlling the strength of the brewed cofiee.

A circuit for causing the elements I32, I33 to become engaged alsowill'be completed through the holding oontactor I34 upon closing of themain switch I 05 and the selective switch I01, said circuit being tracedfrom I29 back to I30 through I08, I09, I08, I36. I34, 535, I02, 93, I03,H1, H3,

. H1 and I52. Upon engagement of the elements I32, I33 and H1, H8, H1, aholding circuit for the contactors I34 and I20 will be established, saidholding circuit being from I29 back to I30 through I3I, I32, I33, I33,I31, I62, I20, I03, H1, H8, H1 and I52.

Engagement of the elements I32, I33 establishes the circuit as beforedescribed including the float switch SI and the solenoid of the valve35, so that closing of the main switch I05 will cause the solenoid ofthe valve 35 to be energized with the same results as before set forth.Also, closing of said main switch I05 will complete the circuit ashereinbefore traced through the electric motors 69 and 11, so that saidelectric motors 68 and 11 will function'in the manner as aforesaid. Theelectric heater 8! likewise will be made operative and then inoperativeand the elements 83, 85 will become separated and the elements 84, 85will become engaged in the manner and with the results as already setforth in response to closing of the main switch I05 and the selectiveswitch I01, exceptthat the solenoids of the valves 59 and 58, instead ofthe solenoids of the valves 55 and 51, will be connected in a circuitfrom I23 back to I30 through I3I, I32, I33,I35, I31, I4!, I42, I43, I41,I54, said solenoids of said valves 55 and 58, I03, H1, H8, H1 and I52.

Energization of the solenoids of the valves 39, 53 and 58 will causesaid valves to be moved to open condition so that water will fiow fromthe main or first tank 20 to the strainer and the granulated coffeebeans contained by said strainer, and also through the vertical pipeconnection 50 and the pipe connection 52 into the auxiliary, third tank22.- And energization of the electric motor-62 will cause the pump 3| tobe operative to accomplish recirculation, from said auxiliary, thirdtank 22 by way of the pipe connection 54 through thepipe connection 59back to the strainer 60 and granulated coffee beans. When the level ofthe coifee brew in the auxiliary, third tank '22 is atelevation to causethe float switch 93 to be in' open condition, the holding circuit forthe oontactor I34 will become broken with the same results ashereinbefore made plain.

The switch I26 is in the circuit required to be closed to cause theelectric motor 68 to become energized, and inasmuch as this switch isretained in open condition at all times other than when the strainer 60is at its proper set position, said electric motor 68 is capable ofoperation to deposit granulated coffee beans into the brewing 11 chamberonly when said strainer is properly situated.

Flushing operations can be accomplished while the strainer 60 is removedfrom the apparatus and the electric motor 53 is incapable of operation.Both the second and third tanks 2! and 22 can be flushed simultaneously,or these tanks can be flushed separately, one being flushed while theother contains brewed coffee. When both of the tanks 2| and 22 are tobeflushed simultaneously, both push buttons l2! and !23 will be depressed.Obviously, the water in the main or first tank 29 will become heated inthe manner as already described. Upon becoming heated, the water willtravel from said main or first tank into the chamber 35, the pipeconnections for coffee brew and said second and third tanks 2! and 22and be recirculated in the manner as aforesaid to cause all of thepassages for coifee' and said tanks 2! and 22 to be flushed. Afterflushing, the second and third tanks 2! and 22 .can be emptied of water.

Hot water will be available at the faucet 2'! from the water jacket 23,and heater elements (not shown) can be provided for maintaining thewater in said water jacket at any temperature which may be preferred.

The various elements of the apparatus can be composed of any materialsuitable to their purposes. Desirably, all of the valves, floats,fittings, pipe connections, etc., can "be of glass. And, too, all of thetanks of said apparatus can be lined with glass.

What is claimed is:

1. An apparatus for making a beverage consisting of liquid and solidsubstances, compris ing a main vessel in which the temperature of theliquid substance is to be elevated, a resistance element for causingsaid main vessel to be heated, a normally closed first fi'oat controlledswitch in the main vessel adapted to be opened in response to raising ofthe level of the liquid in said main vessel, a first connection forliquid from a source of supply to said main vessel, a normally closedfirst electrically operated valve for precluding passage of the liquidby way of said first connection to said main vessel, a vessel forreceiving said beverage, a normally closed second float controlledswitch in the receiving vessel adapted to be opened in response toraising of the level of the beverage in said receiving vessel, a brewingchamber, electrically operated means for delivering a measured amount ofa solid substance to said brewing chamber, a second connection from themain vessel to the brewing chamber, a normally closed secondelectrically operated valve for controlling passage of the liquid by wayof said second connection from said main yessel to said brewing chamber,a third connection between the brewing chamber and said receivingvessel, first contact elements adapted to be engaged when thetemperature of the liquid in the main tank is relatively low,thermostatically op erated means for causing said first contact elementsto become disengaged in response to elevation of the temperature of theliquid in said main vessel, normally disengaged second contact elementsadapted to be engaged in response to manual operation of a switch, acontactor for retaining said second contact elements in engagedrelation, a holding circuit for said contactor controlled by said secondfloat controlled switch and including. the second contact elements, acircuit for the first electrically operated valvecontrolled by saidvfirst float controlled switch adapted to be made in response toengagement of said second contact elements to cause said firstelectrically operated valve to be moved to open condition and to bebroken in response to opening of the first fioat controlled switch topermit the first electrically operated valve to be moved to closedcondition, a circuit for energizing said electrically operated meansadapted to be established in response to manual operation of saidswitch, means for causing said last mentioned circuit to be broken whensaid measured amount of said solid substance has been delivered to saidbrewing chamber, a circuit for said resistance element adapted to beestablished through said first contact elements and to be broken whenthe first contact elements become disengaged, and a circuit for thesecond electrically' operated valve including said second contactelements.

2. An apparatus for making a beverage consisting of liquid and solidsubstances, comprising a main vessel in which the temperature of aliquid substance is to be elevated, a resistance element for causingsaid main vessel to be heated, a normally closed first fioat controlledswitch in the main vessel adapted to be opened in response to raising ofthe level of the liquid in said main vessel, a first connection fordelivering liquid substance to said main vessel from a source of supply,a normally closed first electrically operated valve forprecluding-passage of the liquid substance by way of said firstconnection to said main vessel, a vessel for receiving said beverage, anormally closed second float controlled switch in the receiving vesseladapted to be opened in response to raising of the level of the beveragein said receiving vessel, a brewing chamber, electrically operated meansfor delivering a measured amount of a solid substance to said brewingchamber, a second connection from the main vessel to the brewingchamber, a normally closed second electrically operated valve forcontrolling passage of the liquid substance by way of said secondconnection from said main vessel to said brewing chamber, a thirdconnection between the brewing chamber and said receiving vessel, firstcontact elements adapted to be engaged and second contact elementsadapted to be disengaged when the temperature of the liquid substance inthe main vessel is relatively low, thermostati'cally operated means forcausing said first contact elements to become disengaged and said secondcontact elements to become engaged in response to elevation of thetemperature of the liquid substance in said main vessel, normallydisengaged third contact elements adapted to be engaged inresponse tomanual operation of a switch, a contactor for retaining said thirdcontact ele ments in engaged relation, a holding circuit for saidcontactor controlled by said second float controlled switch includingthe third contact element's, a circuit for said first electricallyoperated valve controlled by said first fioat controlled switch adaptedto be made in response toengagement of said third contact elements tocause said first electrically operated valve to be moved to opencondition and to be broken in response to opening of the first floatcontrolled switch to permit the first electrically operated valve to bemoved to closed condition, a circuit for energizing said electricallyoperated means adapted to be established in response to manual operationof said switch, means for causing said last mentioned circuit to bebroken when said measured amount of said solid substance has beendelivered to said brewing chamber, a circuit for said resistance elementadapted to be established through said first contact elements uponengagement of said third contact elements and to be broken when thefirst contact elements become disengaged, and a circuit for the secondelectrically operated valve adapted to be established through said thirdcontact elements upon engagement of said second contact elements .and tobe broken when the third contact elements become disengaged.

3. The combination as specified in claim 2, a second contactor forretaining said first contact elements in disengaged relation and saidsecond contact elements in engaged relation, and a holding circuit forsaid second contactor including said third contact elements.

4. The combination as specified in claim 1, said circuit for saidelectrically operated valve including said first contact elements, asecond contactor for retaining the first contact ele ments in disengagedrelation, and a holding circuit for said second contactor controlled bysaid second contact elements.

5. The combination as specified in claim 1, an electric motor forcausing the beverage to be pumped from said receiving vessel to saidbrewing chamber in contacting relation with said solid substance, and acircuit for said electric motor controlled by said second contactelements.

6. The combination as specified in claim 2, a fourth connection betweensaid receiving chamber and said brewing chamber, an electric motor forcausing the beverage to be pumped through said fourth connection fromsaid receiving vessel to the brewing chamber in contacting relation withsaid solid substance, and a circuit for said electric motor adapted tobe established through said third contact elements upon engagement ofsaid second contact elements and to be broken when the third contactelements become disengaged.

'7. The combination as specified in claim 2, a second contactor forretaining said first contact elements in disengaged relation and saidsecond contact elements in engaged relation, a holding circuit for saidsecond contactor including said third contact elements, a fourthconnection between said receiving chamber and said brewing chamber, anelectric motor for causing the beverage to be pumped through said fourthconnection from said receiving vessel to the brewing chamber incontacting relation with said solid substance, and acircuit for saidelectric motor adapted to be established through said third contactelements upon engagement of said second contact elements and to bebroken when the third contact elements become disengaged.

8. An apparatus for making a beverage consisting of liquid and solidsubstances, comprising a main vessel in which the temperature of aliquid substance is to be elevated, a resistance element for causingsaid main vessel to be heated, a normally closed first float controlledswitch in the main vessel adapted to be opened in response to raising ofthe level of the liquid in said main vessel, a first connection fordelivering the liquid substance to said main vessel from a source ofsupply, a normally closed electrically operated valve for precludingpassage of the liquid substance by way of said first connection to saidmain vessel, first and second vessels adapted selectively to receivesaid bever- 14 age, normally closed second and third float controlledswitches in the first and second receiving vessels, respectively,adapted to be opened in response to raising of the level of the beveragein said first and second vessels, a brewing chamber, electricallyoperated means for delivering a measured amount of a solid substance tosaid brewing chamber, a second connection from the 7 main vessel to thebrewing chamber, a normally closed second electrically operated valvefor controlling passage of the liquid substance by way of said secondconnection from said main vessel to said brewing chamber, third andfourth connections between the brewing chamber and said first and secondreceiving vessels, respectively, normally closed third and fourthelectrically operated valves for controlling passage of the liquid andsolid substances by way of said third and fourth connections from saidbrewing chamber to said first and second receiving vessels,respectively, first contact elem nts adapted to be engaged and secondcontact elements adapted to be disengaged when the temperature of theliquid substance in the main vessel is relatively low, thermostaticallyoperated means for causing said first contact elements to becomedisengaged and said second contact elements to become engaged inresponse to elevation of the temperature of the liquid substance in saidmain vessel, a first contactor for retaining said first contact elementsin disengaged relation and said second contact elements in engagedrelation, a main switch, first and second selective switches, normallydisengaged third contact elements adapted to be engaged in response tosimultaneous closing of said main switch and either said first or secondselective switch, a second contactor for retaining said third contactelements in engaged relation, third and fourth contactors for retainingsaid first and second selective switches, respectively, in engagedrelation, a holding circuit for said first contactor including saidsecond and third contact elements, a holding circuit for said second andthird contactor-s controlled by said second fioat controlled switchincluding the third contact elements and the first selective switch, aholding circuit for said second and fourth contactors controlled by saidthird fioat controlled switch including said third contact elements andthe second selective switch, a circuit for said first electricallyoperated valve controlled by said first fioat controlled switch adaptedto be made in response to engagement of said third contact elements tocause said first electrically operated valve to be moved to opencondition and to be broken in response to opening of the first floatcontrolled switch to permit the first electrically operated.

.valve to be moved to closed condition, a circuit for energizing saidelectrically operated means adapted to be established in response toclosing of said main switch, means for causing said last mentionedcircuit to be broken when said meas- .third contact "elementszbecomedisengaged, 1-3 circuit ,ior said thirdielectricallyi operated valveadapted ,to beestablished throughithe lthil'diCOl'ltact: elementsupon-'engagementiof :said: second contact elements while-saidfirstselective :switch .is closed and to becomezbroken whenasaid thirdcontact elements become disengaged, and a .cir-

cuit for said fourth electrically operated valve adapted to beestablishedithrough,said..third contact elements. uponyengagement of.the :sec-.

age oftne beverage byway of said fifth and sixth connections fromsaidfirstandsecond rec'eiving vessels, respectively, to said brewingchamber,

said fifth and sixth electrically:operatedvalves, respectively, beingadapted to be included in circuits controlling said thirdandfourthelectrica'lly operated valves, respe'ctively;.-an-electric motorfor causingthe beverage-to be'pumped through said. fifth,connectioni'when-.the'third and" fifth electrically operated valves areopen and through said sixth connection'when the fourth and sixthelectrically operatedvalvesare open' from said first and secondreceiving vessels,-respectively, to the brewing chamber in contactingrelation with said solid substance; and acircuit'forsaidelectric motoradapted to be established'through' said third contact elementsuponengagement of-sa'id second contact elements while either said firstselective switch or said second selective switch is closed and to becomebroken Whenthe third'contact elements become disengaged.

10. In an apparatus of the character described, a main vessel in whichthe temperature of a liquid substance is to-be elevated,aresistanceelement for causing said main vessel to be heated; a normallyclosed first float controlled switch in the main vessel adapted to beopened in response to raising of the level of "the liquid substanceinsaid main vessel, a first connection for liquid substance from a sourceof supplyto saidmain vessel, a normally closed'first electricallyoperated valve for precluding passage of the liquid substance by way ofsaid firstconnectiontosaid main vessel, a vessel for receiving saidliquid, a normally closed second float controlled switch in thereceiving vessel adapted to beopened in response to raising of the levelof the liquid'in said receiving vessel, a chamber, a'second connectionfrom the main vessel to said chamber, a normally closed secondelectrically operated 'valvefor controlling passage of the liquid"substance "by way of said second connection'from said main vessel tosaid chamber, a third connection between the chamber and said receivingvessel, first contact elements adapted to be engaged when thetemperature of the liquid in the main tank is" relatively low,thermostatically operated meansior causing said first contact elementsto become disengaged in response to elevation of the temperature of theliquid substance in said main vessel, normally disengaged second contactelements adapted to be engaged in response to manual operation of aswitch, a contactor for retainingsa'id second contact elements inengaged relation, a holding circuit for said contactor controlled bysaid second floatcontrolled switch and-includ- ,ing thesecondcontactfelements, a circuit foi' 'the :firstelectricallyoperatedvalve controlled by said lfirst'fioat controlled switch adapted to bemade -in rresponse to en-ga'gementof said secondcontact elements to:cause said first electrically operated valve to be moved toopencondition and to beibroken in response to opening of the first-floatz'controlled switch to permit the first electrically operated valve tobe moved to closed condition, a circuit forsaid resistance elementadapted to be established through said first contact elements and to bebroken when the first contact eleorients-become disengaged, and acircuitforthe second electrically operated valve including said secondcontact elements.

' 11. In an apparatus or" the character described,

a. main vessel in which the temperature of a liquid substanceis' to beelevated, a resistance element for causing said main vessel to beheated,

av normally 'closed' first float controlled switch in :20

the main Vessel adapted to beopened in response .to raising of the levelof theliquid in said main vesseLva first connection for deliveringliquid substance to said main vessel from a source of supply, a normallyclosed electrically operated valve for precluding passage of the liquid'substance by way of said first connection to said main vessel, a vesselfor receiving said liquid sub- "stance, a normally closed second floatcontrolled switch in the receiving vessel adapted to be opened inresponse to raising of the level of the liquid in said receiving vessel,a chamber, a

' second connection from the main vessel to said come engaged inresponse to elevation of'the temperature of the liquid substance in saidmain vessel, normally disengaged third contact elements adapted to beengaged in response to manual operation of a switch, a contactor forretaining said third contact elements in engaged relation, a holdingcircuit for said contactor controlled by said second float controlledswitch including the third contact elements, acircuitior said firstelectrically operated valve controlled by said first float controlledswitch adapted to be made in response to engagement of said thirdcontact elements to cause said first electrically operated valve to bemoved to open conditionand to be broken in response to opening ofthefirst float controlled switch to permit the. first electricallyoperated valve to be moved to closed condition, a circuit for saidresistance element adapted to be established through said first contactelements upon engagement of said third contactelements and to be brokenwhen thefirst contact elements become disengaged, and a circuit forthesecond electrically operated'valve adapted to be established throughsaid third contact elements upon engagement of said second contactelements and to be broken when the third contact elements becomedisengaged.

' '12. In an apparatus of the character described, a main vessel inwhich the temperature of a liquid substance is to be elevated, aresistance element for causing'said main vessel to be heated.

a normally closed first fioat controlled switch in the main vesseladapted to be opened in response to raising of the level of the liquidsubstance in said main vessel, a first connection for delivering theliquid substance to said main vessel from a source of supply, a normallyclosed first electrically operated valve for precluding passage of theliquid substance by way of said first connection to said main vessel,first and second vessels adapted selectively to receive said liquidsubstance, normally closed second and third float controlled switches inthe first and second receiving vessels, respectively, adapted to beopened in response to raising of the level of the liquid substance insaid first and second receiving vessels, a chamber, a second connectionfrom the main vessel to said chamber, a normally closed secondelectrically operated valve for controlling passage of the liquidsubstance by way of said second connection from said main vessel to saidchamber, third and fourth connections between the chamber and said firstand second receiving vessels, respectively, normally closed third andfourth electrically operated valves for controlling passage of theliquid substance by way of said third and fourth connections from saidchamber to said first and. second receiving vessels, respectively, firstcontact elements adapted to be engaged and second contact elementsadapted to be disengaged when the temperature of the liquid substance inthe main vessel is relatively low, thermostatically operated means forcausing said first contact elements to become disengaged and said secondcontact elements to become engaged in response to elevation of thetemperature of the liquid substance in said main vessel, a firstcontactor for retaining said first contact elements in disengagedrelation and said second contact elements in engaged relation, a mainswitch, first and second selective switches, normally disengaged thirdcontact elements adapted to be engaged in response to simultaneousclosing of said main switch and either said first or second selectiveswitch, a second contactor for retaining said third contact elements inengaged relation, third and fourth contactors for retaining said firstand second selective switches, respectively, in engaged relation, aholding circuit for said first contactor including said second and thirdcontact elements, a holding circuit for said second and third contactorscontrolled by said second float controlled switch including the thirdcontact elements and the first selective switch, a holding circuit forsaid second and fourth contactors controlled by said third floatcontrolled switch including said third contact elements and the secondselective switch, a circuit for said first electrically operated valvecontrolled by said first fioat controlled switch adapted to be made inresponse to engagement of said third contact elements to cause saidfirst electrically operated valve to be moved to open condition and tobe broken in response to opening of the first fioat controlled switch topermit the first electrically operated valve to be moved to closedcondition, a circuit for said resistance element adapted to beestablished through said first contact elements upon engagement of saidthird contact elements and to be broken when the first contact elementsbecome disengaged, a circuit for said second electrically operated valveadapted to be established through said third contact elements uponengagement of said second contact elements while either said firstselective switch or said second selective switch is closed and to becomebroken when the third contact elements become disengaged, a circuit forsaid third electrically operated valve adapted to be established throughthe third contact elements upon engagement of said contact elementswhile said first selective switch is closed and to become broken whensaid third contact elements become disengaged, and a circuit for saidfourth electrically operated valve adapted to be established throughsaid third contact elements upon engagement of the second contactelements while said second selective switch is closed and to becomebroken when the third contact elements become disengaged.

13. The combination as specified in claim 12, fifth and sixthconnections between said first and second receiving vessels,respectively, and said chamber, normally closed fifth and sixthelectrically operated valves for controlling passage of the liquidsubstance by way of said. fifth and sixth connections from said firstand second receiving vessels, respectively, to said chamber, said fifthand sixth electrically operated valves being in circuits controllingsaid third and fourth electrically operated valves, respectively, anelectric motor for causing the liquid substance to be pumped throughsaid fifth connection when the third and fifth electrically operatedvalves are open and through said sixth connection when the fourth andsixth electrically operated valves are open from said first and secondreceiving vessels, respectively, to the chamber, and a circuit for saidelectric motor adapted to be established through said third contactelements while either said first selective switch or said secondselective switch is closed and to become broken when the third contactelements become disengaged.

RICHARD D. HOTVEDT.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 411,037 Jones Sept. 17, 1889941,009 Cauchois Nov. 23, 1909 1,603,130 McDuffie Oct. 12, 19261,805,159 Bauer et al. May 12, 1931 1,822,433 Brand Sept. 8, 19311,869,720 Strand Aug. 2, 1932 2,067,918 Harper Jan. 19, 1937 2,049,981Fromwiller Oct. 5, 1937 2,450,177 Allen Sept. 28, 1948 2,493,932 SwansonJan. 10, 1950

